BUTT-WELDED JOINT FORMED USING HIGH-ENERGY-DENSITY BEAM

摘要

A welding joint comprises a pair of steel materials, and a welding metal that is formed with a high-energy density beam at a butt welding portion between the pair of steel materials, wherein a transformation starting temperature Ms that is calculated by a following formula: Ms(°C) = 371 - 353C - 22Si - 24. 3Mn - 7. 7Cu - 17. 3Ni - 17. 7Cr - 25. 8Mo, using a composition of mass% of the welding metal is 250°C or less.